Fan



FIG. 1 is a front perspective view of a fan showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof, the left side being a mirror image of the right side shown; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a fan, as shown and described. 